Home » Audio » Measurement » Ping Wayne
Ping Wayne [message #76264] Wed, 10 April 2013 20:19 Go to next message
Mark91845 is currently offline  Mark91845
Messages: 7
Registered: November 2010
Esquire
Hello Wayne. It's been a long time and I hope you are well. Being a speaker designer, I was wondering what you knew about how we hear at different volumes. I read about a study done years ago about how the ear hears frequencies on a curve depending on volume. I am guessing this was the reason for the design of a loudness circuit on some equipment.

Mark
Re: Ping Wayne [message #76267 is a reply to message #76264] Thu, 11 April 2013 08:38 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

Yes, that's the Fletcher-Munson curves, sometimes also called equal loudness curves. These are the result of studies made at Bell Labs in the 1930s by Fletcher and Munson. They asked people to judge when pure tones of two different frequencies were the same loudness, and plotted the resulting charts.

index.php?t=getfile&id=1100&private=0
Re: Ping Wayne [message #76270 is a reply to message #76267] Thu, 11 April 2013 09:09 Go to previous messageGo to next message
Mark91845 is currently offline  Mark91845
Messages: 7
Registered: November 2010
Esquire
Im not sure if this will make any sense, but if this is the case, frequency plots are basicly out the window depending on the volume you listen at ?

Is this just a good case for a "loudness circuit" or eq ?
Re: Ping Wayne [message #76271 is a reply to message #76270] Thu, 11 April 2013 10:20 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18670
Registered: January 2001
Illuminati (33rd Degree)

That's exactly what a loudness circuit does. When you press the "loudness" button on a sound system, it implements EQ based on the Fletcher-Munson curves.

Re: Ping Wayne [message #76272 is a reply to message #76271] Thu, 11 April 2013 10:41 Go to previous message
Mark91845 is currently offline  Mark91845
Messages: 7
Registered: November 2010
Esquire
Cool thanks for the help.
Previous Topic: Oscilloscope for delay measurement
Next Topic: Acoustitape
Goto Forum:
  


Current Time: Thu Mar 28 18:42:03 CDT 2024

Sponsoring Organizations

DIY Audio Projects
DIY Audio Projects
OddWatt Audio
OddWatt Audio
Pi Speakers
Pi Speakers
Prosound Shootout
Prosound Shootout
Smith & Larson Audio
Smith & Larson Audio
Tubes For Amps
TubesForAmps.com

Lone Star Audiofest